proc: Reduce cache miss in xfrm_statistics_seq_show

This is to use the generic interfaces snmp_get_cpu_field{,64}_batch to
aggregate the data by going through all the items of each cpu sequentially.

Signed-off-by: Jia He <hejianet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 2 deletions

diff --git a/net/xfrm/xfrm_proc.c b/net/xfrm/xfrm_proc.c
index 9c4fbd8935f4..ba2b539879bc 100644
--- a/net/xfrm/xfrm_proc.c
+++ b/net/xfrm/xfrm_proc.c
@@ -50,12 +50,18 @@ static const struct snmp_mib xfrm_mib_list[] = {
 
 static int xfrm_statistics_seq_show(struct seq_file *seq, void *v)
 {
+        unsigned long buff[LINUX_MIB_XFRMMAX];
         struct net *net = seq->private;
         int i;
+
+        memset(buff, 0, sizeof(unsigned long) * LINUX_MIB_XFRMMAX);
+
+        snmp_get_cpu_field_batch(buff, xfrm_mib_list,
+                                 net->mib.xfrm_statistics);
         for (i = 0; xfrm_mib_list[i].name; i++)
                 seq_printf(seq, "%-24s\t%lu\n", xfrm_mib_list[i].name,
-                           snmp_fold_field(net->mib.xfrm_statistics,
-                                           xfrm_mib_list[i].entry));
+                                                buff[i]);
+
         return 0;
 }